# Thermofluids (Determine surface temperature)

• Michael24
The heat transfer coefficient between the duct outer surface and the ambient air at Tamb = 0 deg celc is known to be 6W/m2K. Chetan attempted to use the equation q [W] = mcp(Ti-To) where cp is 1010 J/KgK for air flowing through the pipe, but was unsure if it could be applied without knowing the surface heat flux or temperature. He also wondered if the problem could
Michael24

## Homework Statement

Air flows at a mass flow rate(m) of 0.05kg/s in a thin pipe with a diameter of 0.15m. The air enters the pipe at (Ti)103 deg celc and cools to(To) 77 deg celc after traveling 5 m in the pipe. The heat transfer coefficient between the duct outer surface and the ambient air at Tamb = 0 deg celc is ho = 6W/m2K.

Determine the heat flux(W/m2 and the duct surface temperature at x = 5m. The duct wall is thin and conduction effect can be neglected.

## Homework Equations

q''[W/m2] ...Might need this equation ??

## The Attempt at a Solution

q [W] = mcp(Ti-To) = 1313 W where cp = 1010 J/KgK for air flowing through pipe.

If I'm not told that the surface heat flux is constant can I still apply the equation above? Also, without knowing surface conditions such as constant surface heat flux or constant surface temperature is this problem solvable?

Have you learned how to determine the heat transfer coefficient for the internal flow? If so, please tell us how you would proceed.

Chet

## 1. What is thermofluids?

Thermofluids is a branch of science that combines principles of thermodynamics, fluid mechanics, and heat transfer to study the behavior of fluids and their interactions with heat and energy.

## 2. How is surface temperature determined in thermofluids?

The surface temperature of a material can be determined through various methods, including thermocouples, infrared thermometers, and thermal imaging cameras. These tools measure the amount of heat radiated from the surface and use mathematical equations to calculate the surface temperature.

## 3. What factors affect surface temperature in thermofluids?

The surface temperature of a material is influenced by various factors such as the material's thermal conductivity, the temperature and flow rate of the surrounding fluid, and the rate of heat transfer between the surface and the fluid. Other factors include the material's surface roughness, shape, and orientation.

## 4. Can thermofluids be used to improve energy efficiency?

Yes, thermofluids plays a crucial role in improving energy efficiency by optimizing heat transfer processes and fluid flow in various systems. This can lead to reduced energy consumption and cost savings.

## 5. What real-world applications use thermofluids?

Thermofluids has a wide range of applications in industries such as aerospace, automotive, power generation, and HVAC. It is used in designing more efficient engines, improving thermal insulation, and developing renewable energy technologies.

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